Right Click selection selects everything and not just 1 thing
Like bertmoog already said in his comment, the "human" in your scene is a single object, which you have selected.

To edit the vertices, edges and faces, you have to switch into edit mode bypressing Tab or by using the menu in the bottom left corner.

If you want to seperate the single parts of your "human object", you have to enter edit mode, press P and select "By loose parts"